The correct option is Malpighian corpuscle.
Explanation
The nephron is the structural and functional unit of the kidney. It is composed of two principal parts: the renal corpuscle and the renal tubule. The renal corpuscle is responsible for the initial filtration of blood.
- Malpighian corpuscle (Renal Corpuscle): This structure is formed by the combination of the Glomerulus (a tuft of capillaries) and the Bowman’s capsule (a double-walled cup-like structure that encloses the glomerulus). Together, they facilitate the process of ultrafiltration, where plasma is filtered from the capillaries into the renal tubule.
- Renal papilla: This refers to the apex of a renal pyramid which projects into the minor calyx. It acts as a conduit for urine to flow into the renal pelvis, distinct from the filtration unit.
- Vasa recta: These are capillary networks that run parallel to the Loop of Henle in the medulla. They play a crucial role in the counter-current mechanism to concentrate urine but are not part of the corpuscle.
- Macula densa: This is a specialized group of epithelial cells located in the distal convoluted tubule. It functions as a sensor for sodium chloride concentration and regulates glomerular filtration rate.
Key Takeaway: The Malpighian corpuscle (or Renal corpuscle) consists of the Glomerulus and Bowman’s capsule and serves as the primary site for blood filtration in the kidney.